CN109342515A - Concrete mix moisture percentage measuring device and its measurement method based on TDT with phase bit comparison - Google Patents
Concrete mix moisture percentage measuring device and its measurement method based on TDT with phase bit comparison Download PDFInfo
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- CN109342515A CN109342515A CN201811443614.1A CN201811443614A CN109342515A CN 109342515 A CN109342515 A CN 109342515A CN 201811443614 A CN201811443614 A CN 201811443614A CN 109342515 A CN109342515 A CN 109342515A
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- 239000000203 mixture Substances 0.000 title claims abstract description 44
- 238000000691 measurement method Methods 0.000 title claims description 3
- 239000000523 sample Substances 0.000 claims abstract description 69
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims description 25
- 239000004020 conductor Substances 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 24
- 238000013461 design Methods 0.000 abstract description 13
- 239000002689 soil Substances 0.000 abstract description 9
- 230000015271 coagulation Effects 0.000 abstract description 3
- 238000005345 coagulation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 239000013598 vector Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
Abstract
The invention discloses a kind of grinding coagulation soil mixture moisture percentage device for accurately measuring and its method based on time-domain transmission TDT with phase bit comparison.Obtain mix moisture percentage indirectly according to dielectric permittivity, the dielectric constant of medium obtains when being by measuring electromagnetic wave signal along the transmission line being placed in medium；When electromagnetic wave is transmitted along TDT probe, since the end of probe is not open circuit, the signal after electromagnetic wave one-way transmission need to be only detected, and there is no regulations for the detection for reflecting signal.Based on the principle, there can be transmission delay when transmitting in the medium due to electromagnetic wave, the method that the present invention uses phase bit comparison, pass through one Time delay measurement circuit of AD8302 integrated chip design, Time delay measurement circuit and sensor probe is integrated, analog quantity and digital quantity can be exported, measurement accuracy significantly improves, cost is far below the TDT sensor device of same type, has good application prospect.
Description
Technical field
The invention belongs to circuit in electronic information and technical field of information processing, a kind of electromagnetic wave is especially belonged in transmission line
Upper transmission Time-Domain Technique field is related to a kind of accurately surveying based on TDT and the concrete mix mixture moisture percentage of phase bit comparison
Measure devices and methods therefor.
Background technique
Scholar Chernyak has been systematically carried out the research of the dielectric property of soil first, he " wet soil dielectric property is ground
Study carefully method " make soil physics scholar for the first time and has the cognition of globality to Dielectric Constant of NaCl Soil physical behavio(u)r.The dielectric property of soil
Theory can be applied in the measurement of concrete mix moisture percentage.It can be big by dielectric property method according to principle and realizing route
Generally be divided into following several types: Time Domain Reflectometry or transmission vector measurement principle, are handed over the reflective resolution of vectors measuring principle of frequency domain
Anti- measuring principle of fluid capacitance etc..
The principle of Time Domain Reflectometry (TDR) method is to measure time for propagating in the medium of electric wave or speed, is defined with this
Dielectric constant, to obtain medium moisture percentage indirectly.TDR method, which measures concrete mix moisture percentage, has very high accuracy,
But there is also some drawbacks and limitations when practical for TDR technical application: the working frequency of TDR is higher, usually require that 1GHz with
On, it is relatively difficult and hardware cost is increased that this will cause board design；If concrete mix neutral and alkali ion
Concentration is higher, and TDR signal will appear apparent relaxation phenomenon in transmission, to cause that clearly waveform cannot be obtained, even
Back wave cannot be obtained；If medium quality of organic matter score is higher, using need to be corrected again when TDR method dielectric constant with containing wet
Relationship between rate, thus to improve the accuracy of measurement.The above problem all hinders TDR technology and uses and promote.
The principle of frequency domain bounce technique is to generate an ideal test frequency using signal source, measures skill using vector voltage
Art obtains the apparent permittivity ε of mediumrReal and imaginary parts.It can be calculated by the imaginary part of medium apparent dielectric constant
Concrete mix moisture percentage can be calculated according to the real part of dielectric permittivity in the conductivity of medium out.Experiment
Show: the desired frequency range of frequency domain bounce technique work is 20~30MHz, belongs to low frequency, and the dielectric constant pair of mixture
Proportion component is very sensitive, this makes measurement error larger.
Exchange capacitive reactance measuring principle is when testing signal along the transmission line being embedded in concrete mix medium
Frequency, obtain its dielectric constant, and then obtain moisture percentage.This kind of sensor normally run wave frequency range be 20~
150MHz, fast response time are easily realized, at low cost.Sensor based on exchange capacitive reactance measuring principle is disadvantageous in that work
Frequency it is relatively low, the performance of sensor is easy to be influenced by extraneous factor, such as temperature, the conductivity of medium.
The sensor to come into operation now is substantially difficult to keep balance between accuracy and design cost, therefore needs to seek
Look for a principle advanced, circuit is simple, and measurement accuracy is high, reproducible, cost adaptable to dry concrete mixture
The circuit design method of cheap sensor.
Summary of the invention
Deficiency discloses one kind based on time-domain transmission (Time Domain to the present invention according to prior art
Transmissometry, TDT) with the grinding coagulation soil mixture moisture percentage device for accurately measuring of phase bit comparison and its measurement side
Method.The present invention uses one Time delay measurement circuit of AD8302 phase bit comparison integrated chip design, by Time delay measurement circuit and sensing
Device probe is integrated, can export analog quantity and digital quantity, realizes accurate acquisition concrete mix moisture percentage.
The invention is realized by the following technical scheme:
Concrete mix moisture percentage measuring device based on TDT with phase bit comparison, including signal source, phase comparator and
The Time delay measurement circuit that sensor probe is constituted, it is characterised in that:
The signal source is high-frequency oscillating circuits, constitutes parallel LC resonance circuit using voltage controlled oscillation, for being entire system
System provides lasting two-way high-frequency signal；Signal source is connect with phase comparator and sensor probe respectively, by first via high frequency
Signal is sent to sensor probe and forms test signal, and the second road high-frequency signal is sent to phase comparator and forms reference signal；
The sensor probe uses U-shaped double guide rail measuring probes；Measuring probe is embedded in concrete mix admittedly, one end
Connecting signal source, output end are connect with phase comparator test side；
The phase comparator for realizing two paths of signals phase-detection.
The Time delay measurement circuit is converted into the phase difference between test signal and reference signal direct current associated therewith
Signal；It tests signal and reference signal is sine voltage signal, frequency is identical, and phase is different.
The U-shaped probe length L of U-shaped double guide rail measuring probes is 20cm, and the diameter r of probe conductor material is 2mm, double
The distance between conductor R is 10mm.
The high-frequency oscillating circuits use voltage controlled oscillation integrated chip MC1648 chip, 12 foot TANK and 10 foot Bias it
Between external parallel LC resonance circuit.
The phase comparator uses AD8302 phase-detection chip.
The invention also discloses obtain concrete mix moisture percentage measurement method using above-mentioned apparatus.
Including following methods:
U-shaped double guide rail measuring probes are embedded in concrete mix admittedly；
Signal source generates the identical high-frequency signal of two-way amplitude and phase, and first via high-frequency signal is sent sensor and is visited
Capitiform is sent to phase comparator and forms reference signal at test signal, the second road high-frequency signal；First via high-frequency signal is through passing
Phase comparator test side is sent to after sensor probe；
Delay circuit is converted into the phase difference between test signal and reference signal direct current signal associated therewith；Test
Signal and reference signal are sine voltage signal, and frequency is identical, and phase is different；
Concrete mix moisture percentage is obtained according to test signal and the equal phase difference of reference signal.
The present invention obtains mix moisture percentage according to dielectric permittivity indirectly, and dielectric permittivity is by measurement electricity
It is obtained when magnetostatic wave signal is along the transmission line being placed in medium.When electromagnetic wave is transmitted along TDT probe, due to probe
End is not open circuit, therefore need to only detect the signal after electromagnetic wave one-way transmission, and the detection for reflecting signal is not
Regulation.Based on the principle, there can be transmission delay when transmitting in the medium due to electromagnetic wave, the present invention uses the side of phase bit comparison
Method, it is by one Time delay measurement circuit of AD8302 integrated chip design, Time delay measurement circuit and sensor probe is integrated,
Analog quantity and digital quantity can be exported, measurement accuracy significantly improves, and cost is far below the TDT sensor device of same type, this hair
The concrete mix moisture percentage that bright device measurement obtains is accurate, and detection is easy to use, has good application prospect.
Detailed description of the invention
Fig. 1 is apparatus of the present invention composed structure block diagram；
Fig. 2 is apparatus of the present invention principle process block diagram；
Fig. 3 is the U-shaped double guide rail measuring probe schematic diagrames of apparatus of the present invention；
Fig. 4 is apparatus of the present invention signal source partial circuit diagram；
Fig. 5 is apparatus of the present invention phase detection principle block diagram；
Fig. 6 is the ideal individual features curve of phase difference under apparatus of the present invention AD8302 measurement pattern；
Fig. 7 is apparatus of the present invention phase-comparison circuit figure.
Specific embodiment
The present invention is further described With reference to embodiment, specific embodiment be to the principle of the invention into
One step explanation, does not limit the invention in any way, and same or like technology is protected without departing from the present invention with the present invention
Range.
In conjunction with attached drawing.
Concrete mix moisture percentage Fundamentals of Sensors block diagram is as shown in Fig. 2, electromagnetic wave signal is divided into two-way.Pass through all the way
Transmission line is directly sent to the end A of phase comparator, as stablizing electromagnetic wave phase bit comparison benchmark.Another way signal passes through sensor
The end B of input phase comparator after probe carries out phase bit comparison with the sine wave phase reference signal sent from the end A.Initial shape
State, that is, pop one's head in it is exposed in air when, two paths of signals pass through path be ideally seen as it is approximately equal, when probe is embedded to coagulation
When in native mixture, the road B electromagnetic wave signal has the delay of certain time, phase comparator output one when reaching phase comparator
A reaction B lags behind the phase angle α of the A namely time difference T of two-way electromagnetic wave signal transmission.
Sensor probe ring shaped conductor length L it is known that electromagnetic wave conductor one way travel time T can along concrete mix
It is obtained by phase comparator measurement, this can be calculated thus according to the expression formula of concrete mix apparent dielectric constant
When concrete mix in free water content.
One, the design method of U-shaped double guide rail measuring probes.
The pictorial diagram of TDT soil moisture sensor probe is as shown in Figure 3.U-shaped probe can be regarded as one section of transmission line,
What surrounding was filled is that dielectric constant is εrConcrete mix medium, equivalent-circuit model be parallel double conducting wire transmission line.
(1) probe is matched with coax impedance
In the design of sensor probe unit, the problem of being related to impedance matching.If the impedance of probe and coaxial cable is not
Matching, test signal can generate reflection in probe head end, this reflection signal for reflecting signal and probe end be same frequency and
Equidirectional propagation, it can not be separated using circulator.This not only influences to be transferred to the energy of the test signal on probe,
And the phase and amplitude of measured signal can be changed, cause the signal propagation time measured and attenuation all with actually have partially
Difference.
Only as load impedance ZLIt is necessarily equal to the characteristic impedance Z of the transmission line0When, incidence wave does not just reflect.Therefore,
The matched probe used has to pass through meticulous design to reduce signal as far as possible at probe port (i.e. from instrument internal
The coaxial cable of extraction and the junction of probe) reflection.Only as Γ=0, back wave is not just had.If load impedance ZL
Equal to the characteristic impedance Z of the transmission line0, then reflection coefficient Γ=0.Transmission line just reaches matched load in this way, at this time incidence wave
Do not reflect.
The probe of concrete mix moisture percentage used in the present invention belongs to parallel double conducting wire transmission line, is with what probe connected
Coaxial transmission line, the characteristic impedance of transmission line are a real number values.
The characteristic impedance model of coaxial cable are as follows:
Wherein: R is coaxial cable outer conductor copper mesh internal diameter；R is coaxial cable core wire outer diameter；ε dielectric between conductor
Relative dielectric constant.
The characteristic impedance model of parallel double conducting wire are as follows:
It follows that only as the characteristic impedance Z of coaxial cableCWith the characteristic impedance Z of sensor probeSAs far as possible one
When cause, the reflection of electromagnetic wave signal can be avoided.
(2) geometric parameter of probe unit
By the characteristic impedance model of parallel double conducting wire it is found that the characteristic impedance of two-conductor line is and conducting wire surrounding medium and leads
Line center away from and diameter of wire it is related.And measuring medium be variation, therefore the characteristic impedance most of the time and transmission high frequency
Signal impedance mismatches.Here, R is set to 10mm by us, and r is set to 2mm.
According to Utopian sensor probe length, the different sensor probe of L is produced.Pass through the qualitatively side of test
Method, to determine the probe length of TDT soil moisture sensor.Method is as follows:
1. the signal output end of Network Analyzer is connect in one end of TDT probe, while it is 1 signal of the channel of oscillograph is defeated
Enter end and is connected in parallel on interface.The other end of TDT probe connects channel oscilloscope 2.
2. the output signal frequency of Network Analyzer is tuned into 100MHz, slowly TDT probe is protruded into bucket at this time,
Waveform variation is observed, and records phase difference.
3. changing probe length L, repeat the above steps.
It is recorded by observation experiment as a result, finding when probe length L is about 20cm, probe submerges the phase in water completely
Difference is about 180 degree.So we select this length as the probe length of TDT sensor.
(3) selection of probe unit
The present invention is as shown in Figure 3 in probe unit used.It is stainless steel material, probe length L used in probe unit
For 20cm, the diameter r for conductor material of popping one's head in is 2mm；The distance between two-conductor R is 10mm.U-shaped probe is that TDT sensor is visited
The classical architecture of head, it is ensured that signal can return to receiving end, thus greatly reduce the difficulty of signal transit time measurement, but
This sonde configuration sacrifices convenience when measurement, and compact structure integrality can be destroyed by being inserted directly into concrete mix,
It cannot achieve and insert i.e. brake, long-term fixation measuring can only be carried out in preparatory Transducers Embedded in Concrete mixture.
Two, Special electric magnetic wave signal source design method
Electromagnetic wave signal source is high-frequency oscillating circuits composition, to generate stable frequency signal, is provided for whole system
Lasting signal.In order to make TDT concrete mix moisture percentage measuring system measurement accuracy with higher, therefore oscillator must
There must be enough frequency stabilities.The voltage controlled oscillation integrated chip that the present invention uses is MC1648 chip.At 12 feet (TANK)
And 10 external parallel LC resonance circuits between foot (Bias), that is, the high-frequency oscillating circuits of low distortion is constituted, as shown in Figure 4.When to
When the concrete mix moisture percentage of survey changes, the frequency for the high frequency sinusoidal signal that the pin 3 of MC1648 exports also will hair
Changing.
MC1648 uses ECL technique, and maximum operating frequency can reach 225MHz, which utilizes the symmetry to pipe
Reduce the influence for taking leave harmonic wave, stability height, the agc circuit being internally integrated makes the amplitude flatness of oscillator output signal
Preferably.LI and C2 realizes the frequency starting of oscillation in the external parallel LC resonance circuit MC1648, plays vibration frequency and is set as 100MHZ.Inductance L1
It is formed by diameter 0.2mm enameled wire loop coiling, totally 8 circle, coil diameter 0.5cm.Wherein, C2 takes 25PF, C3 and C4 for decoupling
Capacitor filters out power supply noise；C1 is high-frequency filter capacitor, filters out high-frequency parasitic interference.
Three, the design of phase-comparison circuit
TDT sensor probe is " U-shaped ", so each setting one at the probe of electromagnetic radiation end and signal output end
A signal sampling point, sensor circuit measurement is one way transmission of the electromagnetic wave in insertion concrete mix on optical waveguide probe
Time.However, the key that this process is realized is the design of Time delay measurement circuit.
(1) phase detection principle
The key of delay circuit is phase-detection.Its function mainly will be between the test signal and reference signal of input
Phase difference be converted into associated direct current signal, to be calculated for microprocessor after being digitized with A/D converter
Test the time of propagation of the signal on probe.Here test signal and reference signal is the sine voltage signal of same frequency,
Their phase is different.
The functional block diagrams of the phase detectors that the present invention uses is as shown in figure 5, wherein symbolIndicate analog multiplier,
Output signal is the product of two input signals.
Assuming that input signal u1, u2 is respectively as follows:
In formula, ω is signal angular frequency；U1、U2WithIt is the amplitude and initial phase of two signals respectively.They
Product are as follows:
First item is DC component in above formula, and size is related with the amplitude of u1, u2 and phase difference；Section 2 is secondary humorous
Wave signal.DC voltage V1 can be obtained after being filtered using low-pass filter to the output of multiplier, i.e.,
It is also related with their amplitude although V1 here is related to the phase difference of two signals, when phase invariant and
When signal amplitude changes, V1 can also change, this just gives and directly obtains phase difference from V1Bring difficulty.In order to
Solve the problems, such as this, phase shifter, which can be used, by 90 ° of phase change of signal u1 becomes u1It is sent into second together with u2 again afterwards
Multiplier obtains:
DC voltage V2 can be obtained after being filtered using low-pass filter to the output of second multiplier, it may be assumed that
Phase differenceCalculated result is between -180 °~+180 °, in number positive period for determining the phase difference, i.e.,
The phase difference of any range can be measured.
(2) AD8302 working method
The phase-detection chip that the present invention selects is AD8302.The ability of measuring amplitude and phase is concentrated on one by the chip
In block integrated circuit, simplify the design of originally sufficiently complex width phase detection system, and system performance is improved.
Amplitude and phase difference between AD8302 energy two signals of precise measurement is based primarily upon the log compression function of logafier, leads to
Cross two of the precision-matched amplitude and phase measurements realized with logarithm sword wave device fastly to two input channels, can measure simultaneously from
Gain (Amplitude Ratio) and phase difference in low frequency to 2.7GHz frequency between two input signals.
AD8302 phase difference detection chip can measure from low frequency to two input signals in 2.7GHz frequency range it simultaneously
Between Amplitude Ratio and phase difference.The ideal response characteristic curve of the phase difference of AD8302 in measurement mode is as shown in Figure 6.It can see
Out, which directly exports the analog quantity of 0~1.8V, and corresponding is the phase difference for inputting two paths of signals.AD8302 is being surveyed
With 180 ° of phase range when amount.The phase range is also possible to either 0 °~+180 ° (centered on 90 °)
0 °~-180 ° (centered on -90 °).By AD8302 phase difference resonse characteristic at 0 °~+180 ° and at 0 °~-180 °
Slope it is different it is found that can determine that the phase difference of two measured signals is positive or is negative.Logafier in AD8302
Compression function with logarithm, therefore amplitude and phase are namely based on the realization of this function, can be expressed from the next:
VOUT=VSLPlog(VIN/VZ)
Amplitude and phase-detection equation are as follows:
VMAG=VSLPlog(VINA/VINB)
VPHS=Vφ[φ(VINA)-φ(VINB)]
The wherein physical significance of parameters are as follows:
VSLP: slope；VINA: input voltage；VZ: intercept；VMAG: amplitude compares output valve；VPHS: phase bit comparison output valve；
Vφ: slope.
Delay circuit is that the phase-detection function based on AD8302 chip realizes that circuit connection is as shown in Figure 7.
Claims (6)
1. the concrete mix moisture percentage measuring device based on TDT with phase bit comparison, including signal source, phase comparator and biography
The Time delay measurement circuit that sensor probe is constituted, it is characterised in that:
The signal source is high-frequency oscillating circuits, parallel LC resonance circuit is constituted using voltage controlled oscillation, for mentioning for whole system
For lasting two-way high-frequency signal；Signal source is connect with phase comparator and sensor probe respectively, by first via high-frequency signal
It is sent to sensor probe and forms test signal, the second road high-frequency signal is sent to phase comparator and forms reference signal；
The sensor probe uses U-shaped double guide rail measuring probes；Measuring probe is embedded in concrete mix admittedly, one end connection
Signal source, output end are connect with phase comparator test side；
The phase comparator for realizing two paths of signals phase-detection.
2. the concrete mix moisture percentage measuring device according to claim 1 based on TDT with phase bit comparison, feature
Be: the phase difference between test signal and reference signal is converted into direct current associated therewith by the Time delay measurement circuit to be believed
Number；It tests signal and reference signal is sine voltage signal, frequency is identical, and phase is different.
3. the concrete mix moisture percentage measuring device according to claim 2 based on TDT with phase bit comparison, feature
Be: the U-shaped probe length L of U-shaped double guide rail measuring probes is 20cm, and the diameter r of probe conductor material is 2mm, double to lead
The distance between body R is 10mm.
4. the concrete mix moisture percentage measuring device according to claim 2 based on TDT with phase bit comparison, feature
Be: the high-frequency oscillating circuits uses voltage controlled oscillation integrated chip MC1648 chip, between 12 foot TANK and 10 foot Bias
External parallel LC resonance circuit.
5. the concrete mix moisture percentage measuring device according to claim 2 based on TDT with phase bit comparison, feature
Be: the phase comparator uses AD8302 phase-detection chip.
6. the concrete mix moisture percentage measurement method based on TDT with phase bit comparison, it is characterised in that including following methods:
The method uses measuring device described in any one of claim 1 to 5, and U-shaped double guide rail measuring probes are embedded in admittedly
In concrete mix；
Signal source generates the identical high-frequency signal of two-way amplitude and phase, and first via high-frequency signal is sent sensor probe shape
At test signal, the second road high-frequency signal is sent to phase comparator and forms reference signal；First via high-frequency signal is through sensor
Phase comparator test side is sent to after probe；
Delay circuit is converted into the phase difference between test signal and reference signal direct current signal associated therewith；Test signal
It is sine voltage signal with reference signal, frequency is identical, and phase is different；
Concrete mix moisture percentage is obtained according to test signal and the equal phase difference of reference signal.
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Cited By (3)
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|---|---|---|---|---|
| CN109374692A (en) * | 2018-11-29 | 2019-02-22 | 中国水利水电第七工程局有限公司 | A kind of concrete mix sensor measurement frequency preferred method based on dielectric property |
| CN111693580A (en) * | 2020-05-15 | 2020-09-22 | 江苏大学 | Capacitive soil moisture monitoring system and method |
| WO2021215151A1 (en) * | 2020-04-20 | 2021-10-28 | ソニーグループ株式会社 | Detection device and detection method |
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